chore: define uv version once in pre-commit config

[adamtheturtle]

Matches the pattern from literalizer: a YAML anchor .uv_version so the uv pin is declared once and referenced as *uv_version in each hook's additional_dependencies.

pre-commit validate-config may warn about an unexpected root key .uv_version; that is expected and matches literalizer.

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Note

Low Risk
Low risk config refactor that should not change hook behavior, but introduces a nonstandard root key that may trigger pre-commit validate-config warnings.

Overview
Defines a single .uv_version YAML anchor for the uv==0.9.5 pin in .pre-commit-config.yaml and updates all affected local hooks to reference it (additional_dependencies: [*uv_version]) instead of repeating the version string.

No hook commands or stages change; this is purely a maintenance/deduplication change to keep the uv pin consistent across hooks.

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